Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34771
DC FieldValueLanguage
dc.contributor.authorZen, J.M.en_US
dc.contributor.author曾志明zh_TW
dc.contributor.authorTsai, D.M.en_US
dc.contributor.authorYang, H.H.en_US
dc.date2002zh_TW
dc.date.accessioned2014-06-06T07:48:17Z-
dc.date.available2014-06-06T07:48:17Z-
dc.identifier.issn1040-0397zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/34771-
dc.description.abstractA polyviologen-modified glassy carbon electrode (PV-GCE) was applied to directly determine vitamin C (i.e., ascorbic acid) in deeply colored, viscous, and turbid fruit juice samples. Compared to the results obtained at a bare GCE, the oxidation of vitamin C showed a large increase in current response at the PV-GCE in pH 4 buffer solutions. Preconcentration is the major factor for the signal enhancement. Square-wave voltammetry (SWV) was used for vitamin C detection at the PV-GCE. Under the optimized conditions, the SWV current signals showed a very wide linear range (up to 900 muM) with slope band regression coefficient of 0.051 muM muA(-1) and 0.998, respectively. The detection limit (S/N = 3) was 0.38 muM after 20 s of accumulation at open circuit. Since the content of vitamin C and pH value of most fruit juices are lower than 900 muM and close to pH 4, the determination can be done without dilution and other pretreatment of the samples. The results demonstrated a good precision and are in agreement with those obtained with other method.en_US
dc.language.isoen_USzh_TW
dc.relationElectroanalysisen_US
dc.relation.ispartofseriesElectroanalysis, Volume 14, Issue 22, Page(s) 1597-1600.en_US
dc.relation.uri2-uen_US
dc.relation.urihttp://dx.doi.org/10.1002/1521-4109(200211)14:22<1597::aid-elan1597>3.0.coen_US
dc.subjectpolyviologenen_US
dc.subjectvitamin Cen_US
dc.subjectfruit juiceen_US
dc.subjectascorbic-aciden_US
dc.subjectamperometric determinationen_US
dc.subjectelectrocatalytic oxidationen_US
dc.subjectmicrovoltammetric electrodesen_US
dc.subjecthydrogen generationen_US
dc.subjectgraphite-electrodesen_US
dc.subjectanion recognitionen_US
dc.subjectreductionen_US
dc.subjectpolymeren_US
dc.subjectfilmen_US
dc.titleDirect determination of vitamin C in fruit juices using a polyviologen-modified electrodeen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.1002/1521-4109(200211)14:22<1597::aid-elan1597>3.0.co;2-uzh_TW
item.cerifentitytypePublications-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.languageiso639-1en_US-
item.fulltextno fulltext-
item.grantfulltextnone-
item.openairetypeJournal Article-
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